[teiid-issues] [JBoss JIRA] (TEIID-5937) Union All followed by except returns wrong results
Steven Hawkins (Jira)
issues at jboss.org
Fri Apr 17 09:04:43 EDT 2020
[ https://issues.redhat.com/browse/TEIID-5937?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Steven Hawkins updated TEIID-5937:
----------------------------------
Original Estimate: 4 hours
Remaining Estimate: 4 hours
Story Points: 0.5
Sprint: DV Sprint 62
Note that this is an issue with projection optimization due to using an effectively scalar subquery. If you are selecting from regular tables there is no issue.
> Union All followed by except returns wrong results
> --------------------------------------------------
>
> Key: TEIID-5937
> URL: https://issues.redhat.com/browse/TEIID-5937
> Project: Teiid
> Issue Type: Bug
> Components: Query Engine
> Affects Versions: 13.1
> Reporter: Dmitrii Pogorelov
> Assignee: Steven Hawkins
> Priority: Blocker
> Original Estimate: 4 hours
> Remaining Estimate: 4 hours
>
> The following queries return wrong results:
> {code:sql}
> -- <null> though should return 1
> select * from views.test2 except select * from views.test1
> UNION ALL
> select * from views.test1 except select * from views.test2 ;;
>
> -- <null> though should return 1
> (select * from views.test2 except select * from views.test1
> UNION ALL
> select * from views.test1) except select * from views.test2 ;;
> {code}
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